CN102090890A - Magnetic resonance imaging apparatus and magnetic resonance imaging method - Google Patents
Magnetic resonance imaging apparatus and magnetic resonance imaging method Download PDFInfo
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- CN102090890A CN102090890A CN2010105708691A CN201010570869A CN102090890A CN 102090890 A CN102090890 A CN 102090890A CN 2010105708691 A CN2010105708691 A CN 2010105708691A CN 201010570869 A CN201010570869 A CN 201010570869A CN 102090890 A CN102090890 A CN 102090890A
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- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
- G01R33/565—Correction of image distortions, e.g. due to magnetic field inhomogeneities
- G01R33/56509—Correction of image distortions, e.g. due to magnetic field inhomogeneities due to motion, displacement or flow, e.g. gradient moment nulling
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
- G01R33/563—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution of moving material, e.g. flow contrast angiography
- G01R33/5635—Angiography, e.g. contrast-enhanced angiography [CE-MRA] or time-of-flight angiography [TOF-MRA]
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- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/56—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution
- G01R33/567—Image enhancement or correction, e.g. subtraction or averaging techniques, e.g. improvement of signal-to-noise ratio and resolution gated by physiological signals, i.e. synchronization of acquired MR data with periodical motion of an object of interest, e.g. monitoring or triggering system for cardiac or respiratory gating
- G01R33/5673—Gating or triggering based on a physiological signal other than an MR signal, e.g. ECG gating or motion monitoring using optical systems for monitoring the motion of a fiducial marker
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Abstract
The invention provides a magnetic resonance imaging apparatus and a magnetic resonance imaging method. The magnetic resonance imaging apparatus includes an imaging unit and an application region calculating unit. The application region calculating unit automatically calculates an application region of a prepulse according to a region of interest of magnetic resonance imaging based on image data including the region of interest that are acquired before the application of the prepulse. The imaging unit performs magnetic resonance imaging of an object involving the application of the prepulse.
Description
The cross reference of related application
Japanese patent application 2009-283376 number of submitting in 14th based on December in 2009 of the application and Japanese patent application 2010-235837 number of submitting on October 20th, 2010 also require its priority, with the full content mode by reference of this application in conjunction with in this application.
Technical field
Embodiments of the present invention relate to MR imaging apparatus (Magnetic ResonanceImaging Apparatus: hereinafter referred to as the MRI device) and MR imaging method.In addition, embodiments of the present invention relate to the technology of the prepulsing that applies the presaturation pulse that makes the nuclear spin that applies in the zone saturated, inversion recovery pulse (inversion recovery pulse: hereinafter referred to as the IR pulse) etc.
Background technology
MRI (Magnetic Resonance Imaging) is the nuclear spin that the high-frequency impulse (radio frequency pulse: hereinafter referred to as the RF pulse) with Larmor frequency magnetically excites the subject that places magnetostatic field, according to the NMR signal of following this to excite to produce (nuclear magnetic resonance signal: hereinafter referred to as the MR signal) and the image pickup method of reconstructed image.
Utilize in the captured image of MRI, can produce owing to tissue is not limited to the random or non-moving pseudo-shadow (motion artifact) of body that optionally moves and produce.Cycle movement for as the beating of blood vessel shows as afterimage (ghost) according to shooting condition sometimes on certain direction (phase-encoding direction).In addition, for the aperiodicity as swallowing or breathing motion, show as image blurring sometimes or the parallel stripes on certain direction (phase-encoding direction) etc.Also regard these pseudo-shadow mistakes as pathological changes sometimes, may become the obstruction of correct diagnosis.
So, in shooting, before applying by the excitation pulse of using at the data collection of MR signal, apply the presaturation pulse in the specific region based on common MRI, inhibition realizes the improvement of image quality from the MR signal at the living position of the body movable property of the reason that becomes pseudo-shadow.
As with the prior art of this presaturation pulse correlation, known TOHKEMY 2008-289862 communique.The MRI device of being put down in writing in the TOHKEMY 2008-289862 communique shows applying purpose and applying effect etc. of each prepulsing when the setting of shooting condition, and makes decision in the situation that applies a plurality of prepulsings that it applies order.
Decision they apply when order, considered that the signal suppressing effect of the presaturation pulse that the presaturation pulse ratio that in the end applies applied is bigger before it.Thus, make the setting of a plurality of prepulsings of various purposes such as having water excitation, fat suppression become easy.
The invention of TOHKEMY 2008-289862 communique has action effect as described above.Yet, in the shooting of reality, also have the shooting condition that much should set in proper order in addition applying of prepulsing.Particularly, the operator is outside the shooting condition of original region-of-interest, and the image quality improvings such as minimizing that must set with pseudo-shadow are the shooting condition of the prepulsing of purpose.For example in the shooting of vertebra because moving and because beating of the cardiovascular injuries in vertebra the place ahead produces the moving pseudo-shadow of body owing to the body of breathing the abdominal part that produces, so can produce set be used to reduce this body move pseudo-shadow the presaturation pulse apply regional trouble.
In addition, in the MRI device, because according to as t-SLIP (space-time label inversion pulse, Time Spatial Labeling Inversion Pulse) the such technology of utilizing label of method, can separate tremulous pulse and vein and take, so useful for the diagnosis of renal artery etc.Yet make up with taking the location in the zone that applies of a plurality of prepulsings such as the IR pulse of the regioselectivity that this shooting condition need will apply as the pulse that label is used and/or presaturation pulse, so very miscellaneous.
Therefore, expectation make the shooting condition relevant with prepulsing setting than in the past more easier technology.
Summary of the invention
The purpose of an embodiment of the invention is: provide make the shooting condition relevant among the MRI with prepulsing setting than in the past more easier technology, and the present invention is not limited to this purpose.
The related MRI device of embodiment has: imaging portion and apply regional calculating part.Imaging portion is accompanied by the nuclear magnetic resonance of carrying out subject that applies of prepulsing.Apply the view data of regional calculating part, calculate the zone that applies of the described prepulsing corresponding automatically with described region-of-interest based on the region-of-interest of before the applying of described prepulsing, collecting that comprises described nuclear magnetic resonance.
The related MRI method of embodiment has following two steps.A step is: based on the view data of the region-of-interest that comprises subject that utilizes nuclear magnetic resonance to generate, calculate the zone that applies of the prepulsing corresponding with described region-of-interest automatically.A step is: by the nuclear magnetic resonance of carrying out described subject that applies along with described prepulsing, generate view data.
Following with reference to accompanying drawing, the embodiment of MRI device and MRI method is described.To the additional identical symbol of key element identical among each figure, the repetitive description thereof will be omitted.
Description of drawings
Fig. 1 is the block diagram of the structure of the MRI device in expression the 1st embodiment.
Fig. 2 is the functional block diagram of the details of the details of the computer of presentation graphs 1, especially arithmetic unit.
Fig. 3 is the sketch map of the crown cross section picture of the example of used positioning image during as the shooting of vertebra for expression.
Fig. 4 is the sketch map of the sagittal cross section picture of the example of used positioning image during as the shooting of vertebra for expression.
Fig. 5 is the sketch map of expression as the crown cross section picture of the example of the boundary line information of vertebra and body surface.
Fig. 6 is the sketch map of expression as the sagittal cross section picture of the example of the boundary line information of vertebra and body surface.
Fig. 7 is the sketch map of the computational methods that apply the zone of the presaturation pulse in expression the 1st embodiment.
Fig. 8 is the flow chart of the action of the MRI device in expression the 1st embodiment.
Fig. 9 is in the 2nd embodiment, takes and each sagittal cross section picture of change breathing phases gained for utilizing dynamically, obtains the schematic key diagram of the thickness that applies the zone of presaturation pulse.
Figure 10 is the flow chart of the action of the MRI device in expression the 2nd embodiment.
Figure 11 is the block diagram of the structure of the MRI device in expression the 3rd embodiment.
Figure 12 is the sketch map of the computational methods that apply the zone of IR pulse in expression the 4th embodiment and presaturation pulse.
Figure 13 is the flow chart of the action of the MRI device in expression the 4th embodiment.
The specific embodiment
＜the 1 embodiment 〉
The 1st embodiment is be the relevant embodiment of automatization that applies regional setting example and the presaturation pulse with the intervertebral disc of the vertebra " take ".
Fig. 1 is the integrally-built block diagram of the MRI device 20 in expression the 1st embodiment.As shown in Figure 1, MRI device 20 has: the magnetostatic field Magnet 22 that forms the tubular of magnetostatic field; At the shim coil 24 of magnetostatic field with the tubular of coaxial setting in the inboard of Magnet 22; Gradient magnetic field coil 26; RF coil 28; Control system 30; Collapse 32 with the bedroom that bears subject P.As an example,, be that Y direction describes with the vertical direction to mutually orthogonal X-axis, Y-axis, Z axle herein.In addition, the collapse normal direction of face of carrying usefulness of 32 uppermost plate of bedroom is configured to Y direction, magnetostatic field with the direction of principal axis of Magnet 22 and shim coil 24 as Z-direction.
Gradient magnetic power supply 44 has X-axis gradient magnetic power supply 44x, Y-axis gradient magnetic power supply 44y and Z axial gradient magnetic field power supply 44z.In addition, computer 52 has arithmetic unit 60, input equipment 62, display device 64 and storage device 66.
Magnetostatic field is connected with magnetostatic field power supply 40 with Magnet 22, utilizes the electric current of supplying with from magnetostatic field power supply 40 to form magnetostatic field during taking the space.Shim coil 24 is connected with shim coil power supply 42, utilizes the electric current of supplying with from shim coil power supply 42 to make this magnetostatic field homogenization.Magnetostatic field is made of superconducting coil with Magnet more than 22, generally is connected with magnetostatic field power supply 40 when excitation and is supplied to electric current, in case excitation becomes notconnect state later on.In addition, also magnetostatic field power supply 40 can be set, and constitute magnetostatic field Magnet 22 with permanent magnet.
Gradient magnetic field coil 26 has X-axis gradient magnetic field coil 26x, Y-axis gradient magnetic field coil 26y and Z axial gradient field coil 26z, forms tubular at magnetostatic field with the inboard of Magnet 22.X-axis gradient magnetic field coil 26x, Y-axis gradient magnetic field coil 26y are connected with Z axial gradient magnetic field power supply 44z with X-axis gradient magnetic power supply 44x, the Y-axis gradient magnetic power supply 44y of gradient magnetic power supply 44 respectively with Z axial gradient field coil 26z.
Utilization forms the gradient magnetic Gx of X-direction, the gradient magnetic Gy of Y direction and the gradient magnetic Gz of Z-direction from the electric current that X-axis gradient magnetic power supply 44x, Y-axis gradient magnetic power supply 44y and Z axial gradient magnetic field power supply 44z are supplied to X-axis gradient magnetic field coil 26x, Y-axis gradient magnetic field coil 26y and Z axial gradient field coil 26z respectively respectively in taking the space.
The RF coil 28 that sends usefulness receives the RF pulse from RF transmitter 46, sends to subject P.The nuclear spin that the RF coil 28 of reception usefulness receives subject P inside utilizes RF receptor 48 to detect these MR signals owing to the RF pulse excites the MR signal that is produced.
Fig. 2 is the details of the computer 52 of presentation graphs 1, the especially functional block diagram of the details of arithmetic unit 60.As shown in Figure 2, arithmetic unit 60 has: MPU (microprocessor unit, Micro Processor Unit) 80, condition storage part 82, shooting condition configuration part 84, image capture conditions configuration part 86, display control unit 88, image reconstruction portion 90, image processing part 92 and system bus 94.
In the Flame Image Process of MPU80 after setting, shooting action and the shooting of shooting condition, carry out system's control of MRI device 20 integral body via system bus 94.
Shooting condition in the past the shooting is obtained via system bus 94 in shooting condition configuration part 84 from condition storage part 82, the setting of accepting according to operator's shooting condition via input equipment 62.In addition, shooting condition configuration part 84 makes the shooting condition that condition storage part 82 storage changes according to operator's input.And then the result of shooting condition configuration part 84 " the extracted region processing " carried out based on image processing part 92 described later, carry out " prepulsing zone computing ".This point is one of significant feature of present embodiment, determines the zone that applies of presaturation pulse thus.For described " extracted region processing " and " prepulsing zone computing ", in the later explanation of Fig. 8 described later, describe in detail.
Image capture conditions is in the past obtained via system bus 94 in image capture conditions configuration part 86 from condition storage part 82, via the setting of input equipment 62 acceptance from operator's image capture conditions.In addition, image capture conditions configuration part 86 makes the image capture conditions that 82 storages of condition storage part are set according to operator's input.
90 pairs of initial datas from the MR signal of sequence controller 50 inputs of image reconstruction portion are implemented known two-dimensional Fourier transform, generate the view data of each MR image of cutting into slices of subject P.The view data that image reconstruction portion 90 generates to image processing part 92 inputs.
Fig. 3 is the sketch map of expression cross section picture of the coronalplane (Coronal Plane) of the example of used positioning image during as the shooting of vertebra.Fig. 4 is the sketch map of expression cross section picture of the sagittal plane (Sagittal Plane) of the example of used positioning image during as the shooting of vertebra.Among Fig. 3, Fig. 4, the tetragonal frame in the outside represents to comprise the outer rim 100 and 102 of the shooting section of region-of-interest respectively, and its inboard solid line is partly represented the body surface boundary line 104 of subject P, and dotted portion is represented the profile 106 of the in-vivo tissue of subject P.
Fig. 5 is the sketch map of expression as the crown cross section picture of the example of the boundary information of vertebra and body surface.Fig. 6 is the sketch map of expression as the sagittal cross section picture of the example of the boundary information of vertebra and body surface.
The body surface boundary line 104 of representing subject P among Fig. 5 with solid line is represented by dotted lines the profile 108 of spinal column.Represent veutro body surface boundary line 120 and back side bulk table boundary line 122 with solid line among Fig. 6, be represented by dotted lines veutro vertebra boundary line 124 and dorsal part vertebra boundary line 126.
Fig. 7 is the sketch map of the sagittal cross section picture that applies regional determining method of expression presaturation pulse, with the time series order of (1)～(4) as determining method.
After the extraction of the boundary line of Fig. 7 (1) expression vertebra and body surface, Fig. 7 (2) expression presaturation pulse apply the zone after decision, after straight line 134 decisions that Fig. 7 (3) expression contacts with veutro body surface boundary line 120, after the thickness decision that applies the zone of Fig. 7 (4) expression presaturation pulse.
In Fig. 7 (1)～(4), outermost quadrilateral frame is represented the outer rim 116 of the positioning image that display device 64 is shown, and the quadrilateral frame of representing with heavy line in Fig. 7 (2), (3) represents to comprise the outer rim 128 of (behind the location) shooting section of region-of-interest.
In addition, owing to miscellaneous key element that is difficult to see other that in Fig. 7 (4), becomes, so omit the outer rim 128 of taking section.In addition, for the collinear implication with symbol 130,132,134,136,138 expression in Fig. 7 (2)～(4), the Fig. 8 below utilizing describes as the action of MRI device 20.
Fig. 8 is the flow chart of action of the MRI device 20 of expression the 1st embodiment.Below suitably with reference to Fig. 1, Fig. 2, Fig. 5～Fig. 7,, the action of MRI device 20 is described according to flow chart shown in Figure 8.
[step S1] specifies photographic subjects via input equipment 62 (with reference to Fig. 1) by the operator.Be made as appointment " intervertebral disc of vertebra is taken " in the present embodiment and be example.
Shooting condition configuration part 84 (with reference to Fig. 2) makes 82 storages " vertebra " of condition storage part as shooting condition, and obtains the shooting condition that uses in the past as " intervertebral disc of vertebra is taken " from condition storage part 82, and it is inputed to display control unit 88.Display control unit 88 makes display device 64 show the example of the shooting condition that uses in the past as " intervertebral disc of vertebra is taken ".
The operator can serve as with reference to editing the shooting condition of oneself with this displaying contents, and under the situation without any input, shooting condition configuration part 84 is set at takes crown cross section picture and sagittal cross section picture as the used MR image (hereinafter referred to as positioning image) in location of taking section.Here, reason is, is photographic subjects owing to specify " intervertebral disc of vertebra is taken ", so in the ordinary course of things, crown cross section picture and sagittal cross section picture more are suitable for the location than axial (Axial) cross section picture (cross section).
[step S2] positioned the shooting of image when the operator takes at first via input equipment 62 indications by MRI device 20.Thus, the initial data of MR signal inputs to image reconstruction portion 90 from sequence controller 50, and 90 pairs of these initial datas of image reconstruction portion are implemented processing such as two-dimensional Fourier transform, generate the view data of positioning image, and it is inputed to image processing part 92.Image processing part 92 to the Flame Image Process that the view data enforcement of input is stipulated, makes the view data after storage device 66 temporary transient memory images are handled according to the image capture conditions of storage in the condition storage part 82.
[step S3] image processing part 92 is obtained the view data of positioning image from storage device 66, extracts the extracted region of position of the boundary line of vertebra and body surface based on this view data and handles.
In more detail, the view data of crown cross section picture that 92 pairs of image processing parts generate in step S2 and sagittal cross section picture is implemented noise by for example medium filtering (median filter) or corrosion treatment (erosion) and is eliminated processing.
Next, the view data after image processing part 92 is eliminated for noise by implementing threshold process, has obtained and has extracted air part and vertebra covering (mask) image after partly.In general reason is, the air in the MR image and the zone of bone are substantially free of water, thereby hydrogen atom is seldom, thus be reflected as low-signal areas (is black as the MR image), so can distinguish mutually with the zone of other tissue of adjacency.
Next, image processing part 92 generates air and hides picture and vertebra covering picture, wherein to hide similarly be that part with being connected with the low signal part (black region) of the outer edge of image is considered as air section to air, and it similarly is that air section low signal in addition partly is considered as the vertebra zone that vertebra hides.Next, the view data of 92 pairs of positioning images of image processing part uses the edge extracting of differential filter to handle.Image processing part 92 hides picture by this edge extraction of combination result, above-mentioned air covering picture and vertebra, extracts the position, boundary line (with reference to Fig. 5, Fig. 6) of vertebra.
In addition, image processing part 92 based on the view data of crown cross section picture and sagittal cross section picture, carries out the differentiating and processing of vertebra and intervertebral disc for the location of axial cross section picture.
In this differentiating and processing, can utilize the Flame Image Process of prior art, promptly, carry out template matching with photographic images based on the skeleton model of standards such as the shape that comprises for example vertebra and intervertebral disc, size.The boundary line information of vertebra that image processing part 92 will extract like this and intervertebral disc stores earlier, and inputs to shooting condition configuration part 84.
The location that this scanning is carried out in [step S4] shooting condition configuration part 84.For the shooting area in the sagittal cross section of vertebra, be that orthogonal mode positions with respect to the positioning image in crown cross section with the actual visual field (FOV, Field OfView).
In addition, for the direction of the phase code in the shooting area in the sagittal cross section of this vertebra, being set at parallelly with respect to the extending direction of the vertebra that extracts from the positioning image in crown cross section, will be forward to the direction setting of head from foot.
In addition, shooting condition configuration part 84 is with reference to the vertebra zone of extracting from the positioning image in sagittal cross section, to cover the mode in vertebra zone, sets the vertebra zone is added the actual visual field after the surplus of setting as image capture conditions.Shooting condition configuration part 84 is set with the center of taking tangent plane and is taken a plurality of sections by the mode of the center in the vertebra zone of extraction in order to take the sagittal cross section by the vertebra center.
In addition, shooting condition configuration part 84 is in order to take the cross section of each intervertebral disc, based on the boundary line information of vertebra of obtaining at step S3 and intervertebral disc, the location of axial cross section picture of carrying out intervertebral disc is so that take the center of section and the center of intervertebral disc is harmonious, and this slice numbers is set at for example 3.
The setting result of above-mentioned shooting condition is stored in condition storage part 82, and shows in display device 64 by display control unit 88.In addition, the operator can manually adjust the setting of shooting condition as required via input equipment 62.
Among [step S5] step S5, the S6, the computing of prepulsing zone is carried out in shooting condition configuration part 84, calculate among this step S5 the presaturation pulse apply the zone towards, calculate its thickness among the following step S6.In addition, the presaturation pulse in the shooting of vertebra has the purpose that alleviates owing to the moving pseudo-shadow that is brought of body of abdominal part.
Particularly, shooting condition configuration part 84 is based on the vertebra in the sagittal cross section picture of obtaining in step S3 and the boundary line information of body surface, and with respect to the information of the position direction of MR image, veutro and dorsal part in the picture of identification sagittal cross section.
Determine that thus which bar in the boundary line of two body surfaces is veutro body surface boundary line 120 (a perhaps back side bulk table boundary line 122).In like manner determine veutro vertebra boundary line 124 and dorsal part vertebra boundary line 126 (with reference to Fig. 7 (1)).In addition, because the shooting condition that the position direction is imported when respectively being the MR image taking generally speaking with respect to the information of MR image, so can from condition storage part 82, obtain.
Next, shooting condition configuration part 84 is shown in Fig. 7 (2), and calculating will be taken veutro vertebra boundary line 124 linear approximations in the inboard of outer rim 128 of section and the straight line 130 that obtains.
Linear approximation herein for example can adopt after veutro vertebra boundary line 124 is replaced into a large amount of drawing of two-dimensional coordinate system, uses known methods such as method of least square.
In addition, the part that the edge 128 of cutting into slices for the shooting from veutro vertebra boundary line 124 exceeds is considered in the calculating of straight line 130.Shooting condition configuration part 84 with the temporary transient decision of the direction of this straight line 130 for the presaturation pulse apply the zone towards.
[step S6] shooting condition configuration part 84 is in order to calculate the thickness that applies the zone of presaturation pulse, shown in Fig. 7 (2), calculates the circumscribed straight line 132 in and veutro vertebra boundary line from veutro and shooting section scope in parallel with straight line 130 124.
Next, shooting condition configuration part 84 shown in Fig. 7 (3), calculate parallel with straight line 132 and for the interior veutro body surface boundary line 120 of the outer rim 128 of taking section from the contacted with it straight line 134 in the outside of abdominal part.In addition,, do not consider in the calculating of straight line 134 from the part that the edge 128 of taking section exceeds for veutro body surface boundary line 120.
Next, calculate parallel move as one of image capture conditions of straight line 132 ventralward and the straight line 136 (being represented by a pecked line the figure) after the surplus of setting (width that applies area end from the vertebra boundary line to the presaturation pulse) shown in Fig. 7 (4) shooting condition configuration part 84.
For this surplus, can consider on following 2 basis, be redefined for adequate value (for example 1/3 of 10mm, 20mm, vertebra width etc.).The 1st is: when this surplus is too small, even under the situation of subject P fine motion, also can be suppressed because of the presaturation pulse from the MR signal as the vertebra zone of region-of-interest.The 2nd is: when this surplus was excessive, the effect that suppresses the moving pseudo-shadow of region-of-interest body in addition can diminish.
Next, calculate parallel move as one of image capture conditions in the outside (to outer rim 128 sides of taking section) of straight line 134 ventrads and the straight line 138 after the surplus of setting (among the figure by shown in the pecked line) shown in Fig. 7 (4) shooting condition configuration part 84.Surplus herein is equivalent to apply the width of area end to veutro body surface boundary line 120 from the presaturation pulse.
Interval between straight line 136 and the straight line 138 becomes the thickness of presaturation pulse area.That is, shooting condition configuration part 84 will temporarily determine to be the zone that applies of presaturation pulse by straight line 136,138 folded zones, and this applies the zone as shooting condition to make 82 storages of condition storage part.So the presaturation pulse that calculates automatically applies the zone by for example image pattern 7 (4) demonstration in display device 64 like that of display control unit 88.
Herein, the operator can be as required via input equipment 62 change applying of presaturation pulse that (adjustments) show regional towards with width etc.About the applying the zone and do not have under operator's the situation of input of presaturation pulse, (temporary transient decision) presaturation pulse that shooting condition configuration part 84 will calculate as mentioned above automatically apply the zone that applies that regional final decision is the presaturation pulse.
In addition, also can not show the applying the zone of presaturation pulse that calculates automatically as mentioned above and be used for operator's affirmation, but will calculate automatically apply the zone automatically decision be the final zone that applies.
[step S7] basis shooting condition of final decision is as mentioned above taken.That is,, apply RF pulse that image data collection uses etc., the MR signal that utilizes RF receptor 48 to detect from subject P to applying by straight line 136,138 folded zones after the presaturation pulse.
The view data of 92 pairs of inputs of image processing part is implemented the Flame Image Process of regulation, makes the view data after storage device 66 memory images are handled.In addition, the view data after this Flame Image Process is shown control part 88 and is presented in the display device 64.
It more than is the action specification of the MRI device 20 of the 1st embodiment.
So in the 1st embodiment, calculate the related shooting condition that applies the zone of the presaturation pulse of the minimizing that is used for the moving pseudo-shadow of body and (flow) the pseudo-shadow that flows automatically by MRI device 20.Thus, alleviated the burden that the operator carries out the setting of shooting condition.As a result, can improve the disposal ability of the inspection of using the MRI device.
＜the 2 embodiment 〉
The 2nd embodiment in the intervertebral disc of vertebra is taken, calculate automatically the presaturation pulse to apply regional this point identical with the 1st embodiment, and following characteristics are different with the 1st embodiment.
Promptly, in the 2nd embodiment, the view data of phase calculates straight line 136,138 (area end that applies that is equivalent to prepulsing) respectively in the same manner with the 1st embodiment when taking each of (to the same alternation of cross-section time repeatedly take mutually method) gained for utilizing dynamically.Then, be the zone that applies of presaturation pulse with the interval of straight line 136,138 (thickness that applies the zone that is equivalent to the presaturation pulse) zone (temporarily) decision between the straight line 136,138 in the view data of phase when maximum.
The MRI device 20 of the apparatus structure of the 2nd embodiment and Fig. 1, the 1st embodiment shown in Figure 2 is identical, and Therefore, omited structure chart, the symbol of MRI device also are similarly 20 with the 1st embodiment.
Fig. 9 dynamically takes and changes breathing phases and each sagittal cross section picture of obtaining for utilizing, and similarly obtains the sketch map of straight line 136,138 with the 1st embodiment, and the transverse axis among the figure is represented elapsed time t.
Represented in this example owing to become maximum at moment t1 abdominal part thickness, also become maximum (d1) so be equivalent to the interval of the straight line 136,138 that applies regional thickness of presaturation pulse, and become the situation of minima (d2) at the interval of moment t2 straight line 136,138.
Figure 10 is the flow chart of the action of the MRI device 20 in the 2nd embodiment.Below according to flow chart shown in Figure 10, attaching most importance to, the action of the MRI device 20 of the 2nd embodiment is described with the different of the 1st embodiment.
[step S1a] specifies " intervertebral disc of vertebra is taken " as photographic subjects by the operator via input equipment 62 (with reference to Fig. 2), and specifies " dynamically taking " in order to detect because of the change in location of the moving body surface that is brought of body of abdominal part.
[step S2a] then positioned the dynamic shooting of image by MRI device 20 when taking beginning by the operator via input equipment 62 indications.Then, the view data of the positioning image of phase inputed to image processing part 92 with it when image reconstruction portion 90 generated take a plurality of.Image processing part 92 makes each view data after storage device 66 temporary transient memory images are handled.
[step S3a] image processing part 92 is obtained the view data of each MR image of phase when having changed from storage device 66, based on these view data, extract the position, boundary line of vertebra and body surface with the order identical with the step S3 of the 1st embodiment.
The step S4 of [step S4a] shooting condition configuration part 84 and the 1st embodiment carries out the shooting location of this scanning in the same manner.
[step S5a] shooting condition configuration part 84 for obtain the presaturation pulse apply the zone towards, calculate the straight line 130 (with reference to Fig. 7) that veutro vertebra boundary line 124 linear approximations in the picture of sagittal cross section are obtained in the same manner with the step S5 of the 1st embodiment.
For with the calculating of the straight line 130 of these veutro vertebra boundary line 124 linear approximations, can whole view data of phase carry out the view data of phase images in the time of also can be and carrying out when having changed only to certain.This is because in the moving pseudo-shadow of the body of the abdominal part that causes because of breathing, can think that vertebra self does not have the sort of degree of motion.
[step S6a] shooting condition configuration part 84, view data of phase by for each time, by implementing the processing identical repeatedly, thereby calculate the interval (with reference to Fig. 9) that applies the suitable straight line 136,138 of regional thickness with the presaturation pulse respectively with the step S6 of the 1st embodiment.
Mutually view data (being the time phase of moment t1 in Fig. 9) when next, to select the straight lines 136 and the interval (thickness of presaturation pulse area) of straight line 138 be maximum shooting condition configuration part 84.
Next, shooting condition configuration part 84 will be to the apply zone of the temporary transient decision in the zone between the straight line that view data calculated 136,138 of this selection for the presaturation pulse, and this applies the zone as shooting condition to make 82 storages of condition storage part.
The zone that applies of the presaturation pulse that so calculates automatically is shown control part 88 (for example the image in image pattern 9 left sides is such) and is presented in the display device 64.
Herein, the operator can be as required via the presaturation pulse of 62 pairs of demonstrations of input equipment apply the zone towards changing (adjustment) with width etc.Under the situation that does not have the operator about the input that applies the zone of presaturation pulse, (temporary transient decision) that shooting condition configuration part 84 will calculate as mentioned above automatically applies the zone that applies that regional final decision is the presaturation pulse.
In addition, what also can not show the presaturation pulse that calculates automatically as mentioned above applies the zone being used for operator's affirmation, and will calculate automatically apply the zone automatically decision be the final zone that applies.
[step S7a] according to the shooting condition of final decision as mentioned above, takes in the same manner with the step S7 of the 1st embodiment.
More than be the action specification of the 2nd embodiment, in the 2nd embodiment, also can obtain the technique effect identical with the 1st embodiment.
And then, in the 2nd embodiment during for each of gained in dynamically taking the view data of phase calculate respectively quite and the presaturation pulse apply the suitable straight line of area end 136,138.Then with being spaced apart of straight line 136,138 maximum the time phase view data in straight line 136,138 between the temporary transient decision in zone applying the zone and show for the presaturation pulse.Thus, owing to calculate the zone that applies of presaturation pulse automatically based on the view data of phase when abdominal part is the most expansible (, air-breathing phase place), so can suppress the moving pseudo-shadow of body of the abdominal part that causes by breathing reliably.
＜the 3 embodiment 〉
Figure 11 is the integrally-built block diagram of the MRI device 20A in expression the 3rd embodiment.Be with the difference of the 1st embodiment, also be provided with and breathe lock unit 150.
This breathing lock unit 150 has the respiration pickup (electrode) that detects with the chest butt of subject P with the proportional signal of movement of thorax.Breathe lock unit 150 according to from the detection signal of this respiration pickup and computing respiratory curve data, (during for example exhaling) synchronous breathing synchronizing signal should be breathed synchronizing signal and be inputed to sequence controller 50 between the desired period of the breathing cycle of generation and subject P.
In addition, the structure that also can adopt the frequency coding of the collection usefulness of the data for projection that applies the position of breathing that is used to obtain subject P to detect the breathing cycle with the gradient magnetic pulse replaces and breathes lock unit 150.
Particularly, carry out respectively in the Fourier transformation of reading on the direction, generate a plurality of data for projection of the real number space of expression respiratory motion by a plurality of data for projection with time series.Then by with reference to data for projection, can obtain owing to collect the quantity of motion that breathing brought at the shooting positions such as heart of the subject P in the timing of each data for projection, as rate of travel for the shooting position of certain reference position.
As the method for asking for the rate of travel at the shooting position of certain reference position, for example enumerate by obtaining corresponding to the data for projection of reference position and want to obtain cross-correlation between the data for projection of rate of travel, and obtain the method for relative position side-play amount.
Perhaps can be to detect as the optics variable, to detect other structure of breathing cycle etc. by motion with abdominal muscle.
Perhaps can use RMC (real time kinematics is proofreaied and correct, real-time motioncorrection) method to replace and breathe lock unit 150, detect the breathing cycle.RMC is to as the moving real-time gauged technology of the body of the subject of pseudo-shadow reason.
(electrocardiogram electrocardiogram) is collected MPP (motion detection pulse, motion probing pulse) synchronously for example to be accompanied by ECG among the RMC.The collecting zone of correcting imaging data and the data collected are in real time then eliminated the influence of breathing the motion that causes to use based on quantity of motion that MPP was measured.
MPP by for example with recently from comprising the littler phase code amount of phase code amount of the imaging data in transeptate zone, or do not apply phase code and obtain with gradient magnetic.
So, detect the transeptate position about the axon direction of the collection time of MPP the signal that can obtain, as the breathing level from MPP is carried out one-dimensional Fourier transform.That is, because diaphragm descends to the foot side on the axon direction when air-breathing, diaphragm cephalad on the axon direction rises during expiration, so can detect air-breathing phase place and expiration phase place respectively.Thus, just can carry out and the corresponding periodic imaging of expecting of breathing phases.
And, can obtain the amount of change with the reference value of breathing level, the quantity of motion that causes as breathing.And then, make the data collection zone move the suitable amount of movement of quantity of motion that causes with breathing.Can reduce the influence of breathing the motion that causes thus.
The flow process of the action of the MRI device 20A in the 3rd embodiment, identical with the 1st embodiment that utilizes Fig. 8 to illustrate, and be following 3 points with the 1st embodiment different.
The 1st, also specify among the step S1 and breathe synchronously as shooting condition.
The 2nd, before the shooting of the positioning image among the step S2, breathe synchronizing signal from breathing lock unit 150 to sequence controller 50 inputs.MPU80 obtains the breathing synchronizing signal from sequence controller 50, takes the positioning image of air-breathing phase place based on breathing synchronizing signal.
The 3rd, among the step S3,, extract the boundary line of vertebra and body surface based on the view data of the positioning image of air-breathing phase place, among step S5, the S6, based on the view data of the positioning image of air-breathing phase place calculate automatically and decision presaturation pulse apply the zone.
More than, in the 3rd embodiment, also can access and the identical technique effect of the 1st and the 2nd embodiment.And then, because used the breathing synchronizing signal in the 3rd embodiment, so repeatedly take mutually need not change the time for the view data that obtains air-breathing phase place.Therefore, for the moving pseudo-shadow of body that suppress to breathe the abdominal part that causes reliably based on the zone that applies of the view data decision presaturation pulse of air-breathing phase place, on this basis, the number of slices that is used for the positioning image of this decision can be made as minimum.
＜the 4 embodiment 〉
The 4th embodiment is to be example with arteriorenal shooting, calculates the embodiment that applies the zone of IR pulse and these two prepulsings of presaturation pulse automatically.The MRI device 20 of the apparatus structure of the 4th embodiment and Fig. 1, the 1st embodiment shown in Figure 2 is identical, and Therefore, omited structure chart, the symbol of MRI device also are made as 20 in the same manner with the 1st embodiment.
Figure 12 is the figure that the sketch map of the computational methods that apply the zone of expression IR pulse and presaturation pulse is arranged on time series by the order of (1)～(4), the crown cross section of left side expression picture in each figure, and the axial cross section picture is represented on the right side.Particularly, after the extraction in Figure 12 (1) expression kidney zone, after the location is taken in Figure 12 (2) expression, Figure 12 (3) expression IR pulse apply the calculating of zone 220 after, Figure 12 (4) expression presaturation pulse apply the calculating of zone 224 after.In Figure 12 (1)～(4), represent body surface boundary line 200 with thick line respectively, represent kidney zone 204 with oblique line, represent renal artery 208 with solid line, be represented by dotted lines vein 212, quadrilateral frame with solid line is represented (as region-of-interest) shooting area 216, with the quadrilateral frame of a pecked line represent the IR pulse apply the zone 220, with the quadrilateral frame of two pecked lines represent the presaturation pulse apply the zone 224.
Figure 13 is the flow chart of the action of the MRI device 20 of expression the 4th embodiment.Following with reference to Figure 12, the action to MRI device 20 describes according to flow chart shown in Figure 13 simultaneously.
[step S11] is appointed as photographic subjects " renal artery " via input equipment 62 by the operator.Shooting condition configuration part 84 makes condition storage part 82 storage " renal artery " as shooting condition, and from condition storage part 82 exhausted shooting condition during the shooting of obtaining over " renal artery ", it is inputed to display control unit 88.
When [step S12] takes beginning as the operator via input equipment 62 indication, position the shooting of image by MRI device 20, image reconstruction portion 90 generates the view data of positioning images, and it is inputed to image processing part 92.
[step S13] image processing part 92 is obtained the view data of positioning image from storage device 66, based on the position (with reference to Figure 12 (1)) of the boundary line of this image data extraction kidney and body surface.
The extraction in kidney zone, can utilize the Flame Image Process of following prior art, promptly, utilize template matching to extract the internal organs zone consistent with photographic images based on the statistical information of the anthropometric dummies such as relative position relation between the shape that comprises each internal organs such as kidney and lung for example, size, internal organs.Image processing part 92 will store earlier as the kidney that extracts and the boundary line information of body surface, and input to shooting condition configuration part 84.
The location of the shooting area 216 of this scanning is carried out in [step S14] shooting condition configuration part 84.
Particularly, for the shooting area in the axial cross section of renal artery 208 216, be that orthogonal mode positions (with reference to the right side of Figure 12 (2)) with respect to the positioning image in crown cross section with FOV.
In addition,,, add the surplus of setting as image capture conditions, set FOV (with reference to the left side of Figure 12 (2)) to comprise the mode in the kidney zone 204 of from the picture of crown cross section, extracting for the shooting area in the crown cross section 216.
In addition, for the direction of the phase code of this arteriorenal axial cross section picture, be set at the fore-and-aft direction direction of abdominal part (from behind towards) of subject P.
The setting result of above-mentioned shooting condition is stored in condition storage part 82, and is presented in the display device 64 by display control unit 88.In addition, the operator also can manually adjust the setting of shooting condition as required via input equipment 62.
[step S15] in this step S15, calculate automatically the IR pulse apply the zone 220, in following step S16, calculate automatically the presaturation pulse apply the zone 224.Herein owing to be the shooting of renal artery 208, so wish in the crown cross section picture in Figure 12 (2) left side, flow into the MR signal of the blood of shooting areas 216 by suppressing to pass through vein 212, thereby depict the renal artery 208 mobile blood in shooting area 216 effectively from downside (bipod side).
For this reason, at first by to beginning from shooting area 216 universes and apply the IR pulse with being through to its downside, the longitudinal magnetization component of nuclear spin that makes the nuclear spin of the renal artery 216 mobile blood in shooting area 216 and flow into the blood of shooting areas 216 from downside by vein 212 all reverses 180 °.
In the timing different with this IR pulse, being through to more to the lower end from shooting area 216, downside applies the presaturation pulse (the longitudinal magnetization component of nuclear spin is tilted 90 °).Utilize this presaturation pulse, the nuclear spin of blood that flows into shooting areas 216 from downside by vein 212 is with saturated (longitudinal magnetization component become approach zero), and its MR signal is optionally suppressed.Consequently, can optionally depict the blood that flows through the renal artery 208 in the shooting area 216.
Therefore, shooting condition configuration part 84 among this step S15, the court that is cooperating the shooting area 216 that determines among the step S14 is set at axial direction (being the above-below direction of paper in the crown cross section picture in Figure 12 (3) left side) with zone 220 the thickness direction that applies of IR pulse.
In addition, the upper end that applies zone 220 that shooting condition configuration part 84 makes IR pulse in the crown cross section coincide with the upper end of shooting area 216, and is for example 2 times (with reference to the left sides of Figure 12 (3)) of shooting area 216 with regional 220 the thickness setting of applying of IR pulse.
The reason that is made as " 2 times " herein is, mean: suppressing when downside flows into the MR signal of blood of shooting areas 216 by vein 212, it seems with experience, fully width is about 2 times more than or equal to the thickness of shooting area 216, but present embodiment is not to be defined in this numerical value especially.
For the IR pulse apply zone 220 thickness, the MR signal suppressing of blood that can will flow into shooting areas 216 by vein 212 from downside according to hope makes shooting condition configuration part 84 carry out suitable setting to what degree this point.
In addition, the 84 calculating IR pulses of shooting condition configuration part applies zone 220 so that comprise region-of-interest in axial cross section.Herein as an example, what IR pulse in the axial cross sections was set in shooting condition configuration part 84 applies zone 220 coincide with shooting area 216 (describe to such an extent that two lines do not overlap in the axial cross section picture on Figure 12 (3) right side, regional 220 shooting areas of representing than solid box 216 that apply of the IR pulse that a pecked line is represented have some to move to the inside).
What shooting condition configuration part 84 made IR pulse that condition storage part 82 storage calculates as mentioned above applies zone 220 as shooting condition.The zone 220 that applies of the IR pulse of so temporary transient decision is shown control part 88 and is presented in the display device 64 as for example Figure 12 (3).
Herein, the operator can be as required changes (adjustment) via the zone 220 that applies of the IR pulse of 62 pairs of demonstrations of input equipment.Under the situation that does not have the operator about the input that applies the zone that applies zone 220 of IR pulse, (the temporary transient decision) that shooting condition configuration part 84 will calculate as mentioned above automatically applies the zone that applies that applies zone 220 that regional final decision is the IR pulse.
In addition, also can not show the IR pulse that calculates automatically as mentioned above apply zone 220 apply the zone being used for operator's affirmation, and will calculate automatically apply the zone automatically decision be the final zone that applies.
[step S16] shooting condition configuration part 84 is set at the thickness direction that applies zone 224 of prepulsing identical with the thickness direction that applies zone 220 of IR pulse.
In addition, the thickness that applies zone 224 of shooting condition configuration part 84 following setting presaturation pulses.That is, the upper end that applies zone 224 of setting the presaturation pulse in crown cross section coincide with the lower end of shooting area 216, the lower end of presaturation pulse 224 and IR pulse apply regional 220 lower end identical (with reference to the crown cross section picture in the left side of Figure 12 (4)).
That is, in the present embodiment as an example, in crown cross section, the shooting area that adjoins each other 216 and presaturation pulse apply that zone altogether, zone 224 becomes the IR pulse apply zone 220.
What in addition, shooting condition configuration part 84 comprised the temporary transient decision presaturation pulse of region-of-interest ground in axial section applies regional 224.Herein as an example, what presaturation pulse in the axial cross sections was set in shooting condition configuration part 84 applies zone 224 coincide with shooting area 216 (be depicted as two lines in the axial cross section picture on Figure 12 (4) right side and do not overlap, regional 224 shooting areas of representing than solid box 216 that apply of the presaturation pulse that two pecked lines are represented have some to move to the inside).
Shooting condition configuration part 84 applies zone 224 as what shooting condition made presaturation pulse that condition storage part 82 storage sets as mentioned above.So automatically, the zone 224 that applies that calculates the presaturation pulse of (temporary transient decision) is shown control part 88 and is presented in the display device 64 as for example Figure 12 (4).
Herein, the operator can be as required changes (adjustment) via the zone 224 that applies of the presaturation pulse of 62 pairs of demonstrations of input equipment.Under the situation that applies zone 224 input that does not have the operator about the presaturation pulse, (the temporary transient decision) that shooting condition configuration part 84 will calculate as mentioned above automatically apply regional final decision be the presaturation pulse apply zone 224.
In addition, also can not show the presaturation pulse that calculates automatically as mentioned above apply zone 224 apply the zone being used for operator's affirmation, and will calculate automatically apply the zone automatically decision be the final zone that applies.
[step S17] takes according to the shooting condition of as above decision.That is, each zone (220,224) to as above decision applies IR pulse and presaturation pulse in different timings.Afterwards, apply RF pulse that data collection uses etc.
Thus, generating with renal artery 208 is the view data of MR image of the shooting area 216 of object, and is stored in storage device 66.In addition, this view data be shown control part 88 as pictorial display in display device 64.
It more than is the action specification of the MRI device 20 of the 4th embodiment.
In the 4th embodiment, except applying regional 224 of presaturation pulse, also calculate automatically by MRI device 20 in the zone 220 that applies of IR pulse like this.Thus, significantly alleviated the setting burden of operator's shooting condition.As a result, can improve the disposal ability of the inspection of using MRI device 20 greatly.
According to each embodiment of above detailed description, the related shooting condition setting of prepulsing among the MRI was more prone to than in the past.
The additional item of＜embodiment 〉
In [1] the 1st～the 4th embodiment, recorded and narrated in the automatic calculation process that applies the zone of presaturation pulse and IR pulse, used the example of positioning image.Embodiments of the present invention are not limited to described form.Also can be with the decision that other the MR image of taking gained in sequence that carries out before the calculating and determine of zone is used to apply the zone that applies of presaturation pulse and IR pulse.
[2] recorded and narrated the example of in vertebra zone and arteriorenal shooting, using according to the automatic decision method that applies the zone of prepulsing of the present invention.Embodiments of the present invention are not limited to described form.Embodiments of the present invention also can be applied to other regional situations such as acquiring cardiac.
For example under the situation that the situation of acquiring cardiac is described, heart send blood the time shrink on mutually, blood flow into ventricle time go up diastole mutually.Therefore, ECG (the electrocardiogram of also can setting obtaining the heart-beat messages of expression subject P, electrocardiogram) the ECG unit of signal, detect the heart time phase of diastole the most, the image data extraction heart area of phase during based on this determines the zone that applies of prepulsing automatically in the mode of the flow artefacts that suppresses heart and trunk.
Perhaps also can be according to photographic subjects, based on heart shrink the most the time phase the image data extraction heart area, determine the zone that applies of prepulsing automatically.
[3] in addition, the present invention also can be applied to for example to determine automatically zone in the t-SLIP method to select the zone that applies of the non-selection of IR pulse and/or zone IR pulse.
The t-SLIP method is image pickup method a kind of who carries out the labelling of blood herein, uses a plurality of labelling pulses.In the pulse train of t-SLIP method, carry out labelling by applying ASL pulse (pulse of tremulous pulse rotary label, Arterial Spin Labeling Pulse) for the blood that flows into shooting area.
After this, if begin to carry out the collection of MR signal afterwards, just can optionally describe to arrive the blood that the labelling of shooting area is crossed from reversing time (TI:inversion time).
In addition, the pulse train of t-SLIP method comprises zone selection IR pulse at least, can the Zone switched non-switch of selecting the IR pulse.That is, the pulse train of t-SLIP method has the situation of only selecting the IR pulse to constitute by the zone, and selects the IR pulse situation that pulse constitutes with the non-selection in zone IR by the zone.
[4] in the 2nd and the 3rd embodiment, recorded and narrated the example that applies the zone that determines the presaturation pulse based on the view data of the shooting gained when the air-breathing phase place.Embodiments of the present invention are not limited to described form.Also can determine the zone that applies of presaturation pulse based on the view data of the shooting gained when feeling elated and exultant phase place according to the position or the photographic subjects of region-of-interest.
[5] word of claims and the corresponding relation of embodiment are described.In addition, corresponding relation shown below is to be used for a kind of explanation shown in the reference, is not limitation of the invention.
Magnetostatic field with the integral body (with reference to Fig. 1) of Magnet 22, shim coil 24, gradient magnetic field coil 26, RF coil 28, control system 30 be by follow prepulsing apply or the shooting that applies of gradient magnetic and RF pulse generates the structure of view data of the MR image of subject P, be an example of the imaging portion that puts down in writing of claim.
Extract the image processing part 92 (with reference to Fig. 2) of veutro body surface boundary line 120 and veutro vertebra boundary line 124 etc., and the shooting condition configuration part 84 that applies the zone that determines presaturation pulse or IR pulse based on the extraction result of image processing part 92, be the example that applies regional calculating part that claim is put down in writing.
Straight line 130,136 in the 1st embodiment (with reference to Fig. 7 (2), (4)) is respectively the 1st straight line, the 2nd collinear example that claim is put down in writing.
Straight line 134,138 in the 1st embodiment (with reference to Fig. 7 (3), (4)) is respectively the 3rd straight line, the 4th collinear example that claim is put down in writing.
Veutro body surface boundary line 120 is examples of the tissue regions put down in writing of claim.So-called tissue regions is meant for example meaning in the zone of tissues such as body surface (body surface), bone, blood vessel, internal organs of general name.
The presaturation pulse that demonstration calculates automatically by shooting condition configuration part 84 apply the display control unit 88 that applies the zone of zone or IR pulse and the function of display device 64, be an example of the display part put down in writing of claim.
[6] above plurality of embodiments of the present invention is illustrated, but these embodiments propose as just example, be not used in the scope of the present invention that limits.These embodiments can be implemented with other various forms, in the scope that does not break away from spirit of the present invention, just can carry out various omissions, substitute and change.These embodiments and distortion thereof are included in scope of invention and the spirit, equally also are included in the invention that claims put down in writing and in the scope that is equal to it.
Claims (16)
1. MR imaging apparatus is characterized in that possessing:
Imaging portion is accompanied by the nuclear magnetic resonance of carrying out subject that applies of prepulsing;
Apply regional calculating part,, calculate the zone that applies of the described prepulsing corresponding automatically with described region-of-interest based on the view data of the region-of-interest of before the applying of described prepulsing, collecting that comprises described nuclear magnetic resonance.
2. MR imaging apparatus according to claim 1 is characterized in that also possessing:
Display part shows the zone that applies that applies described prepulsing that regional calculating part calculates automatically by described.
3. MR imaging apparatus according to claim 1 is characterized in that,
Describedly apply regional calculating part and constitute: the described prepulsing that will calculate automatically apply the apply zone of zone decision for described prepulsing.
4. MR imaging apparatus according to claim 3 is characterized in that,
Describedly apply regional calculating part and constitute: based on the view data that comprises described region-of-interest, extract the 1st tissue regions and the 2nd tissue regions, automatically calculate the zone that applies of the described prepulsing corresponding with described the 1st tissue regions and the 2nd tissue regions and described region-of-interest.
5. MR imaging apparatus according to claim 4 is characterized in that,
Under the situation that will be used to make the saturated presaturation pulse of nuclear spin to apply as described prepulsing, describedly apply regional calculating part structure based on the described view data that comprises as the vertebra zone of described region-of-interest, extract the vertebra zone as described the 1st tissue regions, the body surface that extracts veutro is as described the 2nd tissue regions.
6. MR imaging apparatus according to claim 3 is characterized in that,
Describedly apply regional calculating part and constitute: under the situation that will be used to make the saturated presaturation pulse of nuclear spin to apply as described prepulsing, based on the described view data that comprises as the vertebra zone of described region-of-interest, extract described vertebra zone, calculating is carried out approximate and the 1st straight line that obtains of straight line to described vertebra zone, calculating is with the 2nd straight line that the predetermined distance of the body surface that do not reach described veutro obtains parallel the moving of described the 1st straight line ventralward, calculates than at least a portion in the zone of the more close described veutro of described the 2nd straight line zone that applies as described prepulsing.
7. MR imaging apparatus according to claim 6 is characterized in that,
Describedly apply regional calculating part and constitute: under the situation that described presaturation pulse is applied as described prepulsing, also based on the described view data that comprises as the vertebra zone of described region-of-interest, extract the body surface boundary line of described veutro, the 3rd straight line that calculating is parallel to described the 1st straight line and contacts with the body surface boundary line of described veutro from the outside of abdominal part, calculate the 4th straight line that described the 3rd straight line is obtained to the parallel mobile predetermined distance in the outside of described abdominal part, calculate zone between described the 2nd straight line and described the 4th straight line as the zone that applies of described prepulsing.
8. MR imaging apparatus according to claim 3 is characterized in that,
Describedly apply regional calculating part and constitute: based on before the applying of described prepulsing, to comprise a plurality of view data of the described nuclear magnetic resonance that the mutually different mode of described region-of-interest and breathing phases collects, the zone that applies of calculating the described prepulsing corresponding with described region-of-interest.
9. MR imaging apparatus according to claim 8 is characterized in that,
Describedly apply regional calculating part and constitute:, extract tissue regions, the zone that applies of calculating the described prepulsing corresponding with described tissue regions and described region-of-interest based on described a plurality of view data.
10. MR imaging apparatus according to claim 9 is characterized in that,
Describedly apply regional calculating part and constitute: the body surface that extracts veutro is as described tissue regions.
11. MR imaging apparatus according to claim 3 is characterized in that,
Describedly apply regional calculating part and constitute: based on before the applying of described prepulsing be accompanied by breathe synchronously and with the described view data of the corresponding mode of the breathing phases described region-of-interest that collect, that comprise described nuclear magnetic resonance of expectation, the zone that applies of calculating the described prepulsing corresponding with described region-of-interest.
12. MR imaging apparatus according to claim 11 is characterized in that,
Describedly apply regional calculating part and constitute:, extract tissue regions, the zone that applies of calculating the described prepulsing corresponding with described tissue regions and described region-of-interest based on the described view data that comprises described region-of-interest.
13. MR imaging apparatus according to claim 12 is characterized in that,
Describedly apply regional calculating part and constitute: the body surface that extracts veutro is as described tissue regions.
14. MR imaging apparatus according to claim 3 is characterized in that,
Described imaging portion constitutes: with the inversion recovery pulse be used for making at least one of presaturation pulse of the saturated spatial selectivity of nuclear spin to apply as described prepulsing.
15. MR imaging apparatus according to claim 3 is characterized in that,
Described imaging portion constitutes: with the inversion recovery pulse be used to make the presaturation pulse of the saturated spatial selectivity of nuclear spin to apply as described prepulsing,
Describedly apply regional calculating part and constitute: calculate and the zone that applies, the zone of described region-of-interest adjacency, and calculate the zone that applies, the zone that applies zone and described region-of-interest that comprises described presaturation pulse as described inversion recovery pulse as described presaturation pulse.
16. a MR imaging method is characterized in that having:
Based on the view data of the region-of-interest that comprises subject that utilizes nuclear magnetic resonance to generate, calculate the step that applies the zone of the prepulsing corresponding automatically with described region-of-interest; With
By being accompanied by the nuclear magnetic resonance of carrying out described subject that applies of described prepulsing, generate the step of view data.
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| US6781375B2 (en) * | 2001-08-31 | 2004-08-24 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging using preparation scan for optimizing pulse sequence |
| CN101441254A (en) * | 2007-04-25 | 2009-05-27 | 株式会社东芝 | Magnetic resonance imaging apparatus |
| CN101548889A (en) * | 2008-03-31 | 2009-10-07 | 株式会社东芝 | Magnetic resonance imaging apparatus and scanning-condition setting method |
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| JP2891514B2 (en) * | 1990-05-28 | 1999-05-17 | 株式会社日立メディコ | Magnetic resonance imaging equipment |
| US5677626A (en) * | 1993-04-27 | 1997-10-14 | Kabushiki Kaisha Toshiba | System for magnetic resonance imaging |
| US5588431A (en) * | 1995-08-17 | 1996-12-31 | The Board Of Trustees Of The Leland Stanford Junior University | Inversion recovery MRI |
| JP3348572B2 (en) * | 1995-08-21 | 2002-11-20 | 株式会社島津製作所 | MR imaging device |
| JP4537542B2 (en) | 2000-06-30 | 2010-09-01 | 株式会社東芝 | Magnetic resonance diagnostic equipment |
| US7190992B2 (en) * | 2002-01-18 | 2007-03-13 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging using technique of positioning multi-slabs to be imaged |
| US7369887B2 (en) * | 2003-06-26 | 2008-05-06 | Mount Sinai School Of Medicine | Rapid multislice black blood double-inversion recovery technique for blood vessel imaging |
| JP2005058428A (en) * | 2003-08-11 | 2005-03-10 | Hitachi Ltd | Lesion locating system and radiation examination device |
| JP5105848B2 (en) * | 2006-02-06 | 2012-12-26 | 株式会社東芝 | Magnetic resonance imaging apparatus and imaging condition setting method in magnetic resonance imaging apparatus |
| US20080194944A1 (en) * | 2006-08-08 | 2008-08-14 | Edelman Robert R | Suppression of background tissues in mra images |
| JP5121219B2 (en) * | 2006-12-07 | 2013-01-16 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | Magnetic resonance imaging apparatus and magnetic resonance imaging method |
| JP2009045251A (en) * | 2007-08-21 | 2009-03-05 | Toshiba Corp | Treatment support equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6781375B2 (en) * | 2001-08-31 | 2004-08-24 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging using preparation scan for optimizing pulse sequence |
| CN101441254A (en) * | 2007-04-25 | 2009-05-27 | 株式会社东芝 | Magnetic resonance imaging apparatus |
| CN101548889A (en) * | 2008-03-31 | 2009-10-07 | 株式会社东芝 | Magnetic resonance imaging apparatus and scanning-condition setting method |
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| CN102854482A (en) * | 2011-06-29 | 2013-01-02 | 西门子公司 | MR-angiography with non-cartesian signal acquisition |
| CN104780838A (en) * | 2012-11-22 | 2015-07-15 | 株式会社东芝 | Magnetic resonance imaging device |
| US10514433B2 (en) | 2012-11-22 | 2019-12-24 | Toshiba Medical Systems Corporation | Magnetic resonance imaging apparatus extracting an intervertebral disk region based on sagittalimages of a subject |
| CN106233154A (en) * | 2014-04-22 | 2016-12-14 | 皇家飞利浦有限公司 | Use prepulsing and the nuclear magnetic resonance with motion correction of omniselector |
| CN106233154B (en) * | 2014-04-22 | 2019-05-31 | 皇家飞利浦有限公司 | Use the magnetic resonance imaging with motion correction of prepulsing and omniselector |
| CN113679372A (en) * | 2020-05-19 | 2021-11-23 | 株式会社日立制作所 | Magnetic resonance imaging apparatus and control program thereof |
| CN112426143A (en) * | 2020-11-16 | 2021-03-02 | 清华大学 | Renal artery and abdominal aorta one-stop type noninvasive magnetic resonance blood vessel wall imaging system |
| CN112426143B (en) * | 2020-11-16 | 2021-07-23 | 清华大学 | Renal artery and abdominal aorta one-stop type noninvasive magnetic resonance blood vessel wall imaging system |
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| JP2011143236A (en) | 2011-07-28 |
| CN102090890B (en) | 2014-08-20 |
| US20110140697A1 (en) | 2011-06-16 |
| US8781185B2 (en) | 2014-07-15 |
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